Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28c5ec28f674c77…

MALICIOUS

PDF

95.1 KB Created: 2021-09-07 01:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 41aea3764ce6e1d7abd57b67d60da39f SHA-1: 2d65ab2ae62eeaf9a320a4116d4d737a39114cdf SHA-256: b28c5ec28f674c774ca9ead51957dc1c283d760169c64ec80d8981bed68a77a6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing attempt impersonating UPS. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, designed to lure users into clicking a malicious URL. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it exploits PDF vulnerabilities to redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=orthographic+drawing+definition+pdf.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://demkapi.com/resimler/files/duvejefexejiwovaxebuje.pdf In PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c00b0e070a3---wadafaxotoromumub.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121903147126---57183738530.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210710_6905B084D3497A0A.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/96270053194.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/fekujasegeromumovu.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/41913143554.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/volezulebafizuxuvizupul.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/gebojar.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a68b9a9d680---24399842512.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ef712a938---tokevupateku.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/dulafaminujunita.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/nowasewetixogotipogazezox.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/jlo1geajno9ul645595fo7g6jk/11565592650.pdfIn PDF document text
    • http://0851gay.org/userfiles/202107file/2021070504295270554.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16092a2e8ecbcd---54454419538.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e4f8cc565---bigujapifaxid.pdfIn PDF document text
    • http://ildong.org/sa_upload/userfiles/file/20210728134525.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/6e21522bf2bd25ac426022ea5466d844/vukejinimesasobo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=orthographic+drawing+definition+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAB 18704 bytes
SHA-256: e36bed85fdc00cf0cf499804b4cf91001d0586eb0b5690d0660077f86df0ac17
font_01_sfnt_off00013e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001561e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1561E 10796 bytes
SHA-256: c5084c88e40aa3073f45dff018d1ab7c096f03e8c392e2143cb042e3d700ac90

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